JP2006215434A - Method for passing plastic optical fiber cable through - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for passing an optical fiber cable through a conduit without causing disconnection. <P>SOLUTION: A passing wire 5 is preliminarily passed through a CD tube 3, with one end of the passing wire 5 tied to a POF cable 9, and with the other end wound on a spool 12 of a dragging device 7. The dragging device 7 has a built-in drag mechanism between an operating handle 15 and the spool 12. The drag mechanism, when a tension above a specific value actuates on the POF cable 9 through the passing wire 5, idles the operating handle 15 to stop winding. By turning a drag adjusting knob 19, the set value for idling the operating handle 15 can be changed. At the time of passing the POF cable 9 through, no tension equal to or above the set value actuates on the POF cable 9, which suppresses generation of disconnection or increase in transmission loss. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for passing a plastic optical fiber cable through a pipeline.

  At present, an optical fiber is widely used as a transmission medium for transmitting a large amount of information, thereby further increasing the speed of information transmission. Optical fibers are widely used from short-distance communication such as indoors and premises to long-distance communication connecting cities. In particular, when an optical fiber is used indoors or on the premises, an optical fiber cable in which the outside of the optical fiber is covered with a covering member such as vinyl is used.

An optical fiber is composed of a core part that transmits light and a clad part that covers the outer periphery of the core part, and is roughly classified into a silica-based optical fiber and a plastic optical fiber (hereinafter referred to as POF) depending on the type of constituent materials. When electronic devices are connected to each other using an optical fiber, an optical fiber cable in which an optical fiber is covered with a covering member is used, thereby preventing the optical fiber from being cut. Further, in some of such optical fiber cables, in order to further increase the tensile strength in the axial direction, the tensile strength wire is covered with a covering member together with the optical fiber. Patent Document 1 discloses an optical fiber cable that has high-tensile steel as a tension member and has high reliability against stress.
Japanese Patent Laid-Open No. 05-088056

  By the way, the POF cable disposed indoors is a conduit such as a CD tube or FS tube (CD tube and FS tube are names defined by “JIS C 8411: Synthetic resin flexible conduit”). Although it is protected by being passed through the pipeline, when the POF cable is forced into the pipeline, if the POF cable is pulled excessively, the tension on the POF cable will be excessive, and the POF cable will There was a case of disconnection. In order to solve such a problem, a POF cable is provided in which a tensile strength wire that can withstand a constant tension is covered with a covering member together with the POF. The tensile strength wire is provided in parallel with the POF in the cable, which makes it possible to provide a POF cable that does not break even when a certain tension is applied.

  However, the POF cable in which the tensile strength wire is covered with the covering member together with the POF becomes thick, and it becomes difficult to pass the existing conduit. In addition, the cost is increased and the flexibility of the POF cable is lost, so that the workability is lowered.

  This invention is made | formed in view of said situation, The objective is to provide the wiring method which lets a POF cable pass in a pipe line, without making it disconnect.

  In order to achieve the above object, the POF cable passing method according to the present invention is the POF cable that is pulled through the conduit and pulled at one end from the other end with a pulling linear member connected to the POF cable. The POF cable is passed through the pipe line, and the POF cable is passed through the pipe line with a tension equal to or less than a predetermined value by a pulling device that pulls the pulling linear body.

  Further, the traction device has a spool that winds the traction linear member from the other end, an operation member that is operated when the spool is rotated, and an operation member that is predetermined by the operation of the operation member. And a drag mechanism that causes the spool to slip when tension greater than the value is applied to the POF cable.

  In addition, the traction device includes a tension reel that winds the traction linear body from the other end, a drive control unit that drives the tension reel so that a tension equal to or less than a predetermined value is applied to the POF cable, It is characterized by providing.

  According to the POF cable passing method of the present invention, the POF cable is passed through the pipe line with a tension equal to or less than a predetermined value by a pulling device that pulls the pulling linear body, so that the POF cable is not disconnected. It is passed through the pipeline.

  In addition, the traction device has a spool that winds the traction linear body from the other end, an operation member that is operated when the spool is rotated, and a value that is determined in advance via the linear body by operating the operation member. By having a drag mechanism that causes the spool to slip when a greater tension is applied to the POF cable, the POF cable is prevented from being disconnected during wiring.

  The traction device includes a tension reel that winds the traction linear body from the other end, and a drive control unit that drives the tension reel so that a tension equal to or less than a predetermined value is applied to the optical fiber cable. By providing, disconnection of the POF cable is prevented.

  A first embodiment of the present invention will be described. As shown in FIG. 1, a CD tube 3 is disposed indoors as a facility tube, and a wire wire 5 that is a linear body is passed through the CD tube 3 in advance. The through wire 5 is, for example, a resin-coated piano wire and can withstand a large tension. One end of the wire 5 is connected to the POF cable 9 and the other end is connected to the traction device 7. The POF cable 9 is entirely made of plastic, and two optical fibers 9a are covered with a covering member 9b. As a result, for example, one optical fiber 9a can be used as an ON / OFF signal transmission line, and the other optical fiber 9a can be used as a transmission line for image data or the like for efficient data transmission.

  The connection of the wire 5 and the POF cable 9 is performed as follows. First, a certain portion of the covering member 9b is removed from the end of the POF cable 9, and the optical fiber 9a is exposed. The exposed portion is folded and stopped with a vinyl tape 10 or the like to form a ring. The ring-shaped optical fiber 9a is similarly folded through the wire 5 and stopped with a vinyl tape. When the thickness of the covering member 9b is thin, the covering member 9b may be directly folded back to form a loop without removing the covering member 9b, and the wire 5 may be connected thereto. Further, the connection method between the wire and the POF cable may be any method other than the above, as long as they can be bundled so that the connection between them is not broken. Moreover, you may use a connection tool etc. as needed.

  The traction device 7 includes a gripping portion 8 gripped by a user, a spool 12 that winds up the wire 5, an operation handle 15 that is operated when the spool 12 is rotated, and the like. The spool 12 and the operation handle 15 are combined so as to apply tension below the set value to the POF cable 9. When tension greater than the set value is applied to the POF cable 9, The spool 12 slips. The set value is predetermined based on a tension value at which the POF cable 9 is not disconnected, and is set to 120 N, for example. This 120N is a measure of the tension that does not affect the plastic optical fiber when, for example, a two-core wire having a width of 4.4 mm and a height of 2.2 mm that does not include a tensile strength wire is pulled. For this reason, even if a tension equal to the installation value is applied to the POF cable 9, there is no disconnection.

  The user can comfortably use the traction device 7 by gripping the grip portion 8 provided on the upper portion of the traction device 7. For example, the user holds the grip 8 with the left hand and rotates the operation handle 15 with the right hand. By operating the traction device 7 in this manner, the user can comfortably wind up the wire 5.

  FIG. 2 shows a cross-sectional view of the traction device 7 partially cut longitudinally along a plane including the axis of the operation shaft 25. In addition to the spool 12 and the operation handle 15, the traction device 7 includes a drag mechanism that controls torque transmitted from the operation handle 15 to the spool 12, and a drag adjustment knob 19 that adjusts torque transmitted by the drag mechanism. The housing 30 pivotally supports the spool 12 and covers the drag mechanism.

  The drag mechanism includes a drag adjustment knob 19, a handle side washer 20, a spool side washer 22, a drag friction member 24, an operation shaft 25, a disc spring 26, a first gear 27, and the like. For example, the handle side washer 20 and the spool side The washer 22 is formed of a stainless alloy, and the drag friction member 24 is formed of carbon graphite. A first gear 27 is rotatably fitted to the operation shaft 25 at one end of the operation shaft 25, and a spool side washer 22 is rotatably fitted to the operation shaft 25 next to the first gear 27. The A drag friction member 24 is rotatably fitted to the operation shaft 25 next to the spool side gear 22, and a handle side washer 20 is fixed to be movable in the axial direction of the operation shaft 25 next to the drawer washer 24. Is done. The drag adjustment knob 19 is screwed onto the operation shaft 25 via a disc spring 26 so as to contact the handle side washer 20. The operation handle 15 is engaged with the other end of the operation shaft 25 so as not to rotate with respect to the operation shaft 25. The material of each of the washer and the drag friction member is not limited to stainless steel or carbon graphite, and other materials may be used as appropriate.

  The handle side washer 20, the drag friction member 24, and the spool side washer 22 are pressed against the first gear 27 side by the drag adjustment knob 19, whereby the first gear 27 can be rotated according to the rotation operation of the operation handle 15. . The second gear 29 engaged with the first gear 27 is assembled to the spool shaft 12a, and the spool 12 rotates in response to the rotation of the first gear 27.

  By tightening the drag adjusting knob 19, the handle side washer 20, the drag friction member 24, and the spool side washer 22 are pressed against the first gear 27 side via the disc spring 26, and the spool is adjusted according to the rotation operation of the operation handle 15. The torque transmitted to 12 increases. Further, when the drag adjusting knob 19 is loosened, the force with which the handle side washer 20, the drag friction member 24, and the spool side washer 22 are pressed against the first gear 27 side becomes weak, and according to the rotation operation of the operation handle 15. The torque transmitted to the spool 12 is reduced. By adjusting the tightening degree of the drag adjusting knob 19 in this way, the tension applied to the POF cable 9 during towing can be adjusted.

  The operation of the above configuration will be described. A CD tube 3 is laid indoors such as a house, and a wire 5 extending from the spool 12 of the traction device 7 is passed through the CD tube 3 in advance. The end of the line cable 5 passed through the CD tube 3 is coupled to an optical fiber 9a formed in a ring shape.

  By adjusting the drag adjustment knob 19, a torque transmitted to the first gear 27 is determined according to the rotation operation of the operation handle 15, whereby the spool 12 winds the wire 5 through the second gear 29. At this time, the tension applied to the POF cable 9 is determined. After the adjustment of the drag adjustment knob 19, the wire 12 is wound up by the spool 12 so that the tension below the set value is applied to the POF cable 9, and the POF cable 9 coupled to the wire 5 is connected accordingly. It is pulled and moves in the CD tube 3 to the traction device 7 side.

  When the POF cable 9 is caught by an obstacle and the tension applied to the POF cable 9 increases, the first gear 27 slips with respect to the operation shaft 25 after the tension applied to the POF cable 9 reaches a set value. Therefore, the tension larger than the set value is not transmitted to the POF cable 9. The set value is determined in advance based on a tension value at which the POF cable 9 is not disconnected, and thus the disconnection of the POF cable 9 can be reliably prevented. When the POF cable 9 stops in the pipeline, the operation of the operation handle 15 is temporarily stopped, the POF cable 9 is pulled back slightly, and the operation handle 15 is rotated again to pull the POF cable 9. Do. By repeating such an operation, the POF cable 9 can be passed through the pipe line without being disconnected.

  In the above-described embodiment, the drag mechanism in which the handle side washer 20, the spool side washer, the drag friction member 24, etc. are fitted to the operation shaft 25 is illustrated. Any operation member may be used as long as it is idle. For example, the drag mechanism may be provided with a one-way clutch mechanism that increases the number of drag friction members and washers, or rotates the operation shaft only in response to a rotation operation in one direction of the operation handle. This can be expected to further enhance the convenience of the traction device.

  Next, a second embodiment of the present invention will be described with reference to FIG. To the traction device 40, a tension reel 42 that winds the wire 5, a motor 45 that rotates the tension reel 42, a drive control unit 47 that supplies a drive voltage to the motor 45, and a voltage supply command to the drive control unit 47 A central processing unit 50, a tension detection unit 52 that detects the tension of the wire 5; a ROM 56 that stores characteristic data and control programs of the motor 45; a dancer roller 62; and a rotation detection unit 65 that detects the rotation of the motor 45. A guide roller 67 for guiding the wire 5 and an alarm 70 for generating an alarm sound are provided.

  The dancer roller 62 is provided so as to be displaceable according to the tension applied to the wire 5. For example, the dancer roller 62 is provided so as to be movable in the vertical direction according to the tension from the wire 5, and the movement of the dancer roller 62 is detected by the displacement detector 75. The displacement detector 75 includes a variable resistor, and sends a displacement detection signal corresponding to the position of the dancer roller 62 to the tension detector 52. In this embodiment, the dancer roller has moved in the vertical direction, but the movement mode of the dancer roller is not limited to this. For example, a dancer roller that moves in an arc may be used. The displacement of the dancer roller 62 may be detected using a photo sensor.

  The tension detector 52 detects the tension applied to the wire 5 based on the displacement detection signal input from the displacement detector 75. The tension detection unit 52 sends a tension detection signal to the central processing unit 50 in accordance with the detected tension.

  The central processing unit 50 calculates the drive voltage supplied to the motor 45 in accordance with the tension detection signal input from the tension detection unit 52. The characteristic data in the ROM 56 indicates the torque exerted by the motor 45 by the drive voltage. When calculating the drive voltage, the central processing unit 50 sets the tension applied to the wire 5 by referring to the characteristic data. The drive voltage is calculated so as to be a value. The set value is determined based on the tension at which the POF cable 9 is not broken. The drive control unit 47 supplies the drive voltage calculated by the central processing unit 50 to the motor 45, and the motor 45 rotates the tension reel 42 according to the supply of the drive voltage. As a result, the tension applied to the POF cable 9 is maintained at the set value.

  The rotation detection unit 65 inputs a rotation detection signal to the central processing unit 50 according to the rotation of the motor 45. The central processing unit 50 inputs a drive stop signal to the drive control unit 47 when rotation is not detected by the rotation detection unit 65 while the drive voltage is supplied to the motor 45. The drive control unit 47 stops the supply of the drive voltage to the motor 45 in response to the input of the drive stop signal, and the motor 45 stops accordingly. This prevents excessive tension from acting on the POF cable 9 and prevents the optical fiber 9a from being disconnected. Further, when the rotation voltage is not detected by the rotation detector 65 when the drive voltage is supplied to the motor 45, the alarm 70 is actuated by a command from the central processing unit 50 and an alarm sound is output to the outside. As a result, the user can immediately know that the winding of the wire 5 has stopped.

  The operation of the second embodiment will be described with reference to the flowchart of FIG. When the operation switch S provided in the traction device 40 is turned on, the tension reel 42 starts to wind up the wire 5, and accordingly, the POF cable 9 connected to the wire 5 starts to be pulled. . Since the tension reel 42 winds up the wire cable 5 so as to pull the POF cable 9 with a constant tension, the POF cable 9 moves in the CD tube 3 without being disconnected.

  When the wire 5 is wound up, if the POF cable 9 is caught by an obstacle or a joint in the pipe and the rotation of the motor 45 is stopped, this is detected by the rotation detection unit 65, and the drive control unit 47 sends it to the motor 45. Is stopped, and an alarm sound is output from the speaker 70. Thereafter, the user once pulls back the POF cable 9 a little, turns on the operation switch S again, and resumes winding of the wire 5. By repeating such a procedure, the POF cable 9 is passed through the pipeline.

  In the above-described embodiment, the supply voltage is calculated by the central processing unit 50 according to the tension detected by the tension detection unit 52, and the drive voltage calculated by the central processing unit 50 is supplied to the motor 45 to generate POF. Although the cable 9 is pulled with a constant tension equal to or less than a predetermined value, the method of pulling the POF cable 9 is not limited to this. For example, the tension reel is driven by a motor that constantly exerts a constant torque, and the tension applied to the POF cable is adjusted to a predetermined value or less by adjusting the tension of the wire passing around the tension reel with a dancer roller. It may be. When the motor always exerts a constant torque, it is not necessary to calculate the drive voltage according to the tension of the wire, and this can provide a traction device with a simpler structure.

  In the above embodiment, the tension applied to the POF cable 9 is kept constant by changing the drive voltage of the motor 45, but the method of keeping the tension constant is not limited to this. For example, there is a method of driving a tension reel by combining a powder clutch or a hysteresis clutch capable of controlling transmission torque with a motor that exhibits a constant torque. When a motor and a tension reel are combined via a powder clutch, the transmission torque of the powder clutch is controlled by a control circuit, and the control circuit controls the powder clutch according to a tension detection signal from the tension detection circuit. Even with a pulling device having such a structure, the POF cable can be pulled with a constant tension equal to or less than a predetermined value.

  Embodiments of the method for passing a plastic optical fiber cable according to the present invention will be described below.

<Example 1>
The CD wire 3 having an inner diameter of 18 mm was passed through the wire 5 in advance. A POF cable 9 is coupled to the through wire 5. The POF cable 9 includes two optical fibers 3 a having an outer diameter of 0.75 mm, and two cores having a thickness of 2.2 mm and a width of 4.4 mm not including a tension member. The type was used. The drag adjusting knob 19 of the traction device 7 was set to 80N in advance. When the operation handle 15 of the traction device 7 is rotated and winding of the wire 5 is started, the tension increases as a result of being slightly caught at several points in the pipeline, but the drag mechanism of the traction device 7 is activated. Thus, a tension greater than 80 N was not applied to the POF cable 9. When this traction device 7 was used to connect the POF cable 9 to the CD tube 3, it was possible to connect 30m. Further, after passing through, the connecting wire 5 was removed and the connector was connected, and when the transmission loss was measured through light through the POF cable 9, no increase in loss was observed.

<Example 2>
A POF cable 9 was connected to one end of a wire 5 that had been passed through a CD tube 3 having an inner diameter of 18 mm in advance, and the other end was wound up by a tension reel 42. The POF cable 9 used was a single-core cable having an outer diameter of 2.2 mm and including one optical fiber 3a having an outer diameter of 0.75 mm and no tension member. The set value of the traction device 40 was preset to 30N. When the operation switch S was turned on and the winding of the wire 5 was started, the POF cable 9 was able to pass 20 m without applying a tension larger than 30N. When the transmission loss was measured after passing the light through the POF cable 9 in the same manner as in Example 1, no increase in loss was observed.

<Comparative example>
The experiment was performed under the same conditions as Experiment 1 except that the other end of the wire was pulled by hand. During winding of the wire 5, the tension was slightly increased at several points, and the tension increased. When pulled as it was, a tension of 120 N or more was applied to the POF cable 9. After transmission, the transmission loss was measured through light in the same manner as in Example 1. As a result, an increase in loss of 2.4 dB was observed.

It is a perspective view explaining the wiring method which lets a POF cable pass to CD pipe | tube by the traction apparatus which has a drag mechanism. It is sectional drawing which cut | disconnected the traction apparatus partially longitudinally in the plane containing the axis | shaft of an operation shaft. It is explanatory drawing explaining the wiring method which pulls a POF cable and passes in a pipe | tube so that fixed tension | tensile_strength may be provided with the traction apparatus provided with the tension reel. It is a flowchart at the time of using the wiring method which lets a POF cable pass along a pipe line using the traction device provided with the tension reel.

Explanation of symbols

3 CD tube 5 Line wire (linear body)
7 Pulling device 9 POF cable 12 Spool 15 Operation handle (operation member)
19 Drag adjustment knob 20 Handle side washer 22 Spool side washer 24 Drag friction member 25 Operation shaft 26 Belleville spring 27 First gear 40 Pulling device 42 Tension reel 45 Motor 47 Drive control section (drive control means)
50 Central processing unit 52 Tension detection unit 62 Dancer roller

Claims (5)

In the method of passing the plastic optical fiber cable, the plastic optical fiber cable is passed through the pipeline by pulling the pulling linear body that is passed through the pipeline in advance and connected at one end to the plastic optical fiber cable from the other end.
A method of passing a plastic optical fiber cable, wherein the plastic optical fiber cable is passed through the conduit with a tension equal to or less than a predetermined value by a pulling device that pulls the pulling linear member.   The traction device has a spool that winds the traction linear member from the other end, an operation member that is operated when the spool is rotated, and a predetermined value that is determined in advance through the linear member by operating the operation member. 2. The method of passing a plastic optical fiber cable according to claim 1, further comprising: a drag mechanism that causes the spool to slip when a tension larger than the above value is applied to the plastic optical fiber cable.   The traction device includes a tension reel that winds the traction linear body from the other end, and a drive control unit that drives the tension reel so that a tension equal to or less than a predetermined value is applied to the plastic optical fiber cable. The method for passing a plastic optical fiber cable according to claim 1, further comprising:   A spool that winds from the other end a pulling linear body that is configured to be connected to a plastic optical fiber cable at one end, an operating member that is operated when the spool is rotated, and the wire that is operated by operating the operating member. And a drag mechanism for slipping the spool when a tension larger than a predetermined value is applied to the plastic optical fiber cable through the cylindrical body. A tension reel that winds a tow-shaped linear body configured to be connected to a plastic optical fiber cable at one end from the other end, and a tension equal to or lower than a predetermined value is applied to the plastic optical fiber cable. And a drive control means for driving the plastic optical fiber cable.

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